標題: Limited Feedback of Precoder and Bit Loading for MIMO Systems: A Joint Design
作者: Chen, Hung-Chun
Lin, Yuan-Pei
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Bit loading;joint codebook design;limited feedback;MIMO system;precoder
公開日期: 1-十二月-2013
摘要: This paper jointly considers limited feedback of bit loading and precoder. In the past when both precoder and bit loading are fed back to the transmitter, the feedback rate is often allocated between the two using an ad hoc approach and codebooks are designed separately rather than jointly. In this paper we allocate feedback rate in a systematic manner by analyzing the effect of quantization on transmission power. The analysis allows us to obtain the rate allocation that minimizes the power penalty due to limited feedback. As both precoder and bit loading are fed back to the transmitter, the information embedded in one can be exploited for the design of the other. To take advantage of bit loading feedback, which carries valuable information on the importance of individual subchannels, we employ multiple precoder codebooks, each tailored to a bit loading vector in the bit loading codebook. The multi-codebook scheme enjoys significant gain over the single-codebook case that does not take bit loading feedback into consideration. Simulations are given to demonstrate that the proposed system can achieve a very good performance due to carefully designed feedback rate allocation and joint codebook designs.
URI: http://dx.doi.org/10.1109/TSP.2013.2281785
http://hdl.handle.net/11536/23240
ISSN: 1053-587X
DOI: 10.1109/TSP.2013.2281785
期刊: IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume: 61
Issue: 23
起始頁: 6091
結束頁: 6102
顯示於類別:期刊論文


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